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This is best. See the works of The Decapitator, an anonymous graffiti artist who’s been attacking London’s billboard ads.
He (or she)’s got a unique signature style - Photochopping heads off well-known ads and replacing them with gory images of severed necklines. Blood an all.
Follow The Decapitator’s Flickr photostream sampler below. Fun.
How it’s done.

Will we soon [...]